CN102063236A - Method for identifying pressure sensitive electronic whiteboard by touch - Google Patents
Method for identifying pressure sensitive electronic whiteboard by touch Download PDFInfo
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- CN102063236A CN102063236A CN 201010611585 CN201010611585A CN102063236A CN 102063236 A CN102063236 A CN 102063236A CN 201010611585 CN201010611585 CN 201010611585 CN 201010611585 A CN201010611585 A CN 201010611585A CN 102063236 A CN102063236 A CN 102063236A
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- pressure sensitive
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Abstract
The invention provides a method for identifying a pressure sensitive electronic whiteboard by touch, comprising the following steps of: presetting strength reference intervals of three states including mouse operation, writing pen operation and erasing operation; when the body of the pressure sensitive electronic whiteboard is pressed, detecting the contacted point of X-position on an X work surface; detecting internal parameters Z1 and Z2 of a touch screen for reflecting the relationship between the contacted point and the X work surface and a Y work surface; expressing a value of a contact resistor RTOUCH by a computing formula; and by post-processing treatment, converting the value of the contact resistor RTOUCH into a pressure value of the pressed pressure sensitive electronic whiteboard, and comparing the pressure value with the strength reference interval and judging so as to distinguish the type of the press on the pressure sensitive electronic whiteboard, which belongs to the three states including mouse operation, writing pen operation and erasing operation corresponding to three operation modes of the writing pen, the finger and the fist palm. Therefore, the method has the advantage that the automatic identification of three operation modes of the writing pen, the finger and the fist palm is supported on the pressure sensitive electronic whiteboard, thereby achieving the direct interactive operation between a user and the whiteboard.
Description
[technical field]
The present invention relates to a kind of electronic whiteboard, particularly a kind of pressure sensitive electric whiteboard is realized the method for touch recognition.
[background technology]
Electronic whiteboard is the new high-tech product that has compiled multiple high-tech means research and development such as most advanced and sophisticated electronic technology, software engineering, it is by using different principle such as electromagnetic induction, pressure sensitive, optoelectronic induction, in conjunction with computing machine and projector, can realize with no paper office and teaching.Electronic whiteboard is divided into two kinds of pressure sensitivity principle and Laser Tracking principles by principle of work.The touch blank of use pressure sensitivity principle is equivalent to a touch-screen of computing machine, is a kind of human-computer interaction formula input equipment of finishing the work of appointment with shown option on finger or style of writing and the screen.There is two-layer resistive film this electronic whiteboard inside, when whiteboard surface a bit is under pressure, two-layer resistive film causes short circuit in this, and the controller of electronic whiteboard detects the coordinate figure of pressure spot (position that finger or style of writing reach), sends into computing machine through the RS232 interface.
Pressure sensitive electric whiteboard is divided into plate body usually and is located at the interior control circuit board of plate body, as shown in Figure 1, the basic structure of its plate body 2 comprises that film 25 is write on a backboard 21, an internal layer resistive film 22, an air barrier 23, one outer resistive film 24 and a surface of setting from inside to outside.
Each layer resistive film 22 (24) is a workplace of touch-screen, be respectively X workplace and Y workplace, (the X workplace is a transverse ends at the two ends of each workplace, the Y workplace is vertical two ends) respectively post a copper-foil conducting electricity, the pair of electrodes that is called this workplace, being called X " electrode pair " is X+, X-, and Y " electrode pair " is Y+, Y-.Controller by an electronic whiteboard applies a voltage of determining on X " electrode pair " again, and on the Y " electrode pair " not during making alive, will form evenly continuous parallel electric field on the workplace at X " electrode pair " place.When touching the surface and write film 25 with finger, the voltage at place, contact has reflected the position of contact on the X workplace, and this voltage is guided to touch screen controller by Y+ (or Y-) electrode, and changes through A/D, just can obtain the digital quantity of contact voltage, i.e. the X coordinate.In like manner, applying voltage on Y " electrode pair ", is potential electrode with X+ (or X-) electrode, just can record the Y coordinate.
From the above, when film 25 was write on the surface of pressing plate body 2 with finger or blank pen, internal layer resistive film 22 and outer resistive film 24 two-layer resistive films linked together at the place of pressing, and then can realize the location of blank planar point by coordinate.The resistance value of pressing the resistance value that is on X and the Y direction and other positions is different, therefore can calculate the actual coordinate value of X and Y by converting, and delivers to the relevant treatment that system computer carries out mouse action or picture aspect.
When not having object contact plate body 2 surfaces, internal layer resistive film 22 and outer resistive film 24 can have repellence under no pressure condition.When writing or pointing the surface of pressing plate body 2 with writing pencil and write film, internal layer resistive film 22 and outer resistive film 24 link together at the place of pressing, electric current will change by the voltage of conducting film, read by circuit for detecting, this voltage is relevant with touch point position, voltage according to reading from level and vertical direction can be scaled X, the Y coordinate position at place, touch point, and then can get access to the actual coordinate value that finger is pressed on plate body 2 surface.Process chip on the circuit is sent to computing machine with these data by communication cable, realizes the function of mouse action again by the driver of operating system layer.
But present pressure sensitive electric whiteboard writing pencil is write or is pointed a little on time, and plate only limits to detect this a kind of processing mode of the coordinate figure of pressure spot, and can't realize writing pen, finger, three kinds of mode of operation automatic identifications on plate body of the fist palm.
[summary of the invention]
The technical problem to be solved in the present invention, be to provide a kind of pressure sensitive electric whiteboard to realize the method for touch recognition, support lettering pen, finger, three kinds of mode of operation automatic identifications on the pressure sensitive electric whiteboard plate body of the fist palm, thereby realize the direct interactive operation between user and the blank.
The present invention is achieved in that a kind of method of pressure sensitive electric whiteboard realization touch recognition, and it specifically comprises the steps:
Step 10, the dynamics of mouse action, lettering pen operation, these three kinds of states of erase operation that preestablishes are with reference to the interval;
Step 20, when pushing on the plate body of pressure sensitive electric whiteboard, detect contacting points position X-Positon on the X workplace;
The touch-screen inner parameter Z of the relation between step 30, detection reflection contact and X workplace and Y workplace
1And Z
2
Step 40, the following computing formula of employing are calculated contact resistance R
TOUCHValue:
In the formula, the conversion accuracy of the touch screen chip that the n representative is adopted; R
X-plateBe X+ and X-two interelectrode all-in resistances on the X workplace, it is a definite value on same pressure sensitive electric whiteboard, need not to measure;
Step 50, handle by late time data, contact resistance R
TOUCHValue be converted into the force value of pushing on the sub-blank of electrification, again the dynamics in this force value and the step 10 is compared judgement with reference to the interval, belong to any in the operation of mouse action, lettering pen, three kinds of states of erase operation thereby distinguish pushing on this pressure sensitive electric whiteboard.
Wherein:
The dynamics of the operation of lettering pen described in the described step 10 is pressed from big to small setting with reference to the dynamics of the numerical value in the interval, described erase operation with reference to the numerical value in interval with reference to interval interior numerical value, the dynamics of described mouse action.
X in the described step 20
-PositionValue and the Z in the described step 30
1And Z
2The value of two parameters is to sample respectively and obtain by special instruction 0xD0,0xB0,0xC0 that the touch screen controller in the described pressure sensitive electric whiteboard provides.Described touch screen controller is that model is the four-wire type touch screen controller of ADS7846 or TSC2046.
In the described step 40, n equals 8,10 or 12.
The present invention has following advantage: touch identification method of the present invention, support lettering pen, finger, three kinds of mode of operation automatic identifications on plate body of the fist palm, and cooperation blank software can be realized the direct interactive operation between user and the blank.When with clipboard face, what call is the pencil function of blank software, and what call with finger touch plate face is mouse, and what call during with fist or palm touch pad face is the blackboard eraser function of blank software.
[description of drawings]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is the structural representation of the plate body of a pressure sensitive electric whiteboard in the prior art.
Fig. 2 is the structural representation of a recognition system of realization the inventive method.
Fig. 3 is the structural representation of a kind of touch screen controller of relating in the inventive method.
Fig. 4 is the inventive method FB(flow block).
[embodiment]
Touch screen controller of the present invention can be that model is the four-wire type touch screen controller of ADS7846 or TSC2046, wherein TSC2046 is the renewal version of ADS7846, support the low-voltage I/O interface of 1.5V to 5.25V, the complete compatible previous generation's product of its inner structure and pin package, as shown in Figure 2, the plate body 2 that during use touch screen controller 1 one ends is connected pressure sensitive electric whiteboard, the other end is by Serial Peripheral Interface (SPI) (SPI, Serial Peripheral Interface) be connected with CPU3, wherein touch screen controller 1 and CPU3 all are located on the control circuit board (not shown) of pressure sensitive electric whiteboard.Below be the structure that example illustrates this touch screen controller with TSC2046.
As shown in Figure 3, be the structural representation of the TSC2046 type touch screen controller 1 that relates in the inventive method.It comprises: a contact identification circuit module 11, a signal input part 12,1 channel to channel adapters 13, a CDAC modular converter 14, a comparer 15, a successive approximation register 16, serial datum interface 17, a temperature sensor 18 and a battery cell monitoring module 19.Its annexation is: described contact identification circuit module 11, signal input part 12,6 channel to channel adapters 13, CDAC modular converter 14, comparer 15, successive approximation register 16, serial data interface 17 connect in turn; Described CDAC modular converter 14 also is connected with successive approximation register 16; Described temperature sensor 18 and battery cell monitoring module 17 all are connected to 6 channel to channel adapters 13.Among the present invention, the function of above-mentioned each module is as follows:
Contact identification circuit module 11; When the plate body 2 plate face generation face contacts of pressure sensitive electric whiteboard, provide response signal to CPU3 immediately, CPU3 can carry out subsequent operation according to this signal;
Signal input part 12: have four terminals, be respectively X+, X-, Y+, Y-, corresponding four-wire resistance type touch screen;
6 channel to channel adapters 13:, switch corresponding signalling channel and carry out detection according to the different command word that CPU3 sends;
CDAC modular converter 14: be electric capacity digital analog converter Capacitor Digital-to-AnalogConverter---CDAC, itself and comparer 15, successive approximation register 16 (Successive-Approximation Register---SAR) constitute an analog digital modular converter jointly, finish the high accuracy number conversion of current channel input signal voltage;
Serial data interface 17: be SPI interface (Serial Peripheral Interface, Serial Peripheral Interface (SPI))
Temperature sensor 18:, can realize real-time detection to environment temperature if design needs;
Battery cell monitoring module 19:, can realize real-time detection to battery electric quantity if design needs.
Foregoing TSC2046 type touch screen controller, in conjunction with Fig. 1 to Fig. 4, an embodiment of the inventive method can realize as follows:
Step 10, the dynamics of mouse action, lettering pen operation, these three kinds of states of erase operation that preestablishes are with reference to the interval, and be stored in the described successive approximation register 16, the dynamics of described lettering pen operation is pressed from big to small setting with reference to the dynamics of the numerical value in the interval, described erase operation with reference to the numerical value in interval with reference to interval interior numerical value, the dynamics of described mouse action.As: supposition has a＜b＜c, and the interval distribution of dynamics that can establish three kinds of states is as follows:
Wipe-(0, a); Mouse-[a, b]; Lettering pen-(b, c).
Step 20, when on contact identification circuit module 11 detects the plate body 2 of pressure sensitive electric whiteboard, pushing, provide response signal to CPU3, CPU3 receives that this signal enters corresponding code segment, and utilization touch screen controller 1 detects contacting points position X-Positon on the X workplace; During detection, CPU3 sends corresponding control command 0xD0 to touch screen controller 1 by serial data interface 17,6 channel to channel adapters, the 13 gating Y+ of its inside, X+ and X-are worth as reference, as establish X+=100, X-=0, again by a certain amount of voltage signal of CDAC modular converter 14 outputs, comparer 15 can compare the output of CDAC modular converter 14 and the input of current channel analog signal, approaching up to both, successive approximation register 16 is preserved the corresponding digital quantity of CDAC modular converter 14 each outputs, and receives last transformation result by CPU3, is designated as X-Positon.
The touch-screen inner parameter Z of the relation between step 30, detection reflection contact and X workplace and Y workplace
1And Z
2:
Detect Z
1The time, 6 channel to channel adapters, 13 gating X+ as with reference to value, as establish Y+=100 with Y+ and X-, X-=0, and CPU3 sends corresponding control command 0xB0 to touch screen controller 1 by serial data interface 17, and receives by the result after touch screen controller 1 conversion, is designated as Z
1
Detect Z
2The time, 6 channel to channel adapters, 13 gating Y-as with reference to value, as establish Y+=100 with Y+ and X-, X-=0, and CPU3 sends corresponding control command 0xC0 to touch screen controller 1 by serial data interface 17, and receives by the result after touch screen controller 1 conversion, is designated as Z
2
Step 40, the following computing formula of employing are calculated contact resistance R
TOUCHValue:
In the formula, the conversion accuracy of the touch screen chip that the n representative is adopted is generally 8,10,12 three kinds, so n can equal 8,10 or 12 according to the touch screen chip that is adopted; R
X-plateBe X+ and X-two interelectrode all-in resistances on the X workplace, it is a definite value on same pressure sensitive electric whiteboard, need not to measure;
Step 50, handle by the CPU3 late time data, contact resistance R
TOUCHValue be converted into the force value of pushing on the pressure sensitive electric whiteboard, and compare judgement with reference to the interval with dynamics in the step 10, belong to any in mouse action, lettering pen operation, three kinds of states of erase operation thereby distinguish pushing on this pressure sensitive electric whiteboard.If force value=x that current detection arrives, and a≤x≤b, the then current mouse state that is operating as.
Afterwards, withdraw from this section code, finish touch recognition.If when needing to switch mutually between mouse action, lettering pen operation, three kinds of states of erase operation, only need to set the identification code of different conditions at the bottom hardware of pressure sensitive electric whiteboard, send the corresponding states sign indicating number of this identification behind the end of identification immediately to computing machine, the switching that blank software is carried out difference in functionality according to status code gets final product, and need not artificial selection.
As mentioned above, touch identification method of the present invention is supported lettering pen, finger, three kinds of mode of operation automatic identifications on plate body of the fist palm, and cooperation blank software can be realized the direct interactive operation between user and the blank.When with clipboard face, what call is the pencil function of blank software, and what call with finger touch plate face is mouse, and what call during with fist or palm touch pad face is the blackboard eraser function of blank software.
Though more than described the specific embodiment of the present invention; but being familiar with those skilled in the art is to be understood that; our described specific embodiment is illustrative; rather than be used for qualification to scope of the present invention; those of ordinary skill in the art are in the modification and the variation of the equivalence of doing according to spirit of the present invention, all should be encompassed in the scope that claim of the present invention protects.
Claims (5)
1. the method for a pressure sensitive electric whiteboard realization touch recognition is characterized in that: specifically comprise the steps:
Step 10, the dynamics of mouse action, lettering pen operation, these three kinds of states of erase operation that preestablishes are with reference to the interval;
Step 20, when pushing on the plate body of pressure sensitive electric whiteboard, detect contacting points position X-Positon on the X workplace;
The touch-screen inner parameter Z of the relation between step 30, detection reflection contact and X workplace and Y workplace
1And Z
2
Step 40, the following computing formula of employing are calculated contact resistance R
TOUCHValue:
In the formula, the conversion accuracy of the touch screen chip that the n representative is adopted; R
X-plateBe X+ and X-two interelectrode all-in resistances on the X workplace, it is a definite value on same pressure sensitive electric whiteboard, need not to measure;
Step 50, handle by late time data, contact resistance R
TOUCHValue be converted into the force value of pushing on the pressure sensitive electric whiteboard, again the dynamics in this force value and the step 10 is compared judgement with reference to the interval, belong to any in the operation of mouse action, lettering pen, three kinds of states of erase operation thereby distinguish pushing on this pressure sensitive electric whiteboard.
2. a kind of pressure sensitive electric whiteboard according to claim 1 is realized the method for touch recognition, it is characterized in that: the dynamics of the operation of lettering pen described in the described step 10 is pressed from big to small setting with reference to the dynamics of the numerical value in the interval, described erase operation with reference to the numerical value in interval with reference to interval interior numerical value, the dynamics of described mouse action.
3. a kind of pressure sensitive electric whiteboard according to claim 2 is realized the method for touch recognition, it is characterized in that: the X in the described step 20
-PositionValue and the Z in the described step 30
1And Z
2The value of two parameters is to sample respectively and obtain by special instruction 0xD0,0xB0,0xC0 that the touch screen controller in the described pressure sensitive electric whiteboard provides.
4. a kind of pressure sensitive electric whiteboard according to claim 3 is realized the method for touch recognition, and it is characterized in that: described touch screen controller is that model is the four-wire type touch screen controller of ADS7846 or TSC2046.
5. a kind of pressure sensitive electric whiteboard according to claim 1 is realized the method for touch recognition, and it is characterized in that: in the described step 40, n equals 8,10 or 12.
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| CN 201010611585 CN102063236A (en) | 2010-12-29 | 2010-12-29 | Method for identifying pressure sensitive electronic whiteboard by touch |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019437A (en) * | 2012-10-29 | 2013-04-03 | 苏州大学 | Touch type electronic whiteboard |
| CN103279220A (en) * | 2013-05-13 | 2013-09-04 | 南昊（北京）科技有限公司 | Interactive intelligent whiteboard application system |
| CN103973975A (en) * | 2014-04-10 | 2014-08-06 | 北京智谷睿拓技术服务有限公司 | Interaction method, interaction device and user equipment |
| CN104615375A (en) * | 2015-02-04 | 2015-05-13 | 华为技术有限公司 | Method and device for image scaling and broadcast content switching of handheld electronic equipment |
| US20160125225A1 (en) * | 2013-06-28 | 2016-05-05 | Sony Corporation | Underlay body |
| CN105760019A (en) * | 2016-02-22 | 2016-07-13 | 广州视睿电子科技有限公司 | Touch operation method based on interactive whiteboard and system thereof |
| CN106201120A (en) * | 2016-07-14 | 2016-12-07 | 深圳市艾博德科技股份有限公司 | A kind of infrared electronic white board writes the control method of scanning and scanning system and infrared electronic white board lettering pen |
| CN107132944A (en) * | 2017-03-23 | 2017-09-05 | 福建天泉教育科技有限公司 | A kind of method for deleting and system for electronic whiteboard |
| WO2017185575A1 (en) * | 2016-04-28 | 2017-11-02 | 北京金山办公软件有限公司 | Touch screen track recognition method and apparatus |
| CN108376046A (en) * | 2018-01-25 | 2018-08-07 | 链家网（北京）科技有限公司 | A kind of method, interactive system and device suitable for remote interaction |
| CN110058723A (en) * | 2019-01-28 | 2019-07-26 | 北京科加触控技术有限公司 | A kind of Writing method, apparatus and system |
| CN114115686A (en) * | 2021-10-22 | 2022-03-01 | 北京壹人壹本信息科技有限公司 | Method and device for separating hand, stylus and touch in H5 webpage handwriting application and storage medium |
| CN114115686B (en) * | 2021-10-22 | 2024-04-30 | 北京壹人壹本信息科技有限公司 | Method, device and storage medium for separating hand touch pen and touch in H5 webpage handwriting application |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019437A (en) * | 2012-10-29 | 2013-04-03 | 苏州大学 | Touch type electronic whiteboard |
| CN103279220A (en) * | 2013-05-13 | 2013-09-04 | 南昊（北京）科技有限公司 | Interactive intelligent whiteboard application system |
| US20160125225A1 (en) * | 2013-06-28 | 2016-05-05 | Sony Corporation | Underlay body |
| US9911029B2 (en) * | 2013-06-28 | 2018-03-06 | Sony Corporation | Underlay body for acquisition of handwriting information |
| CN103973975B (en) * | 2014-04-10 | 2017-11-07 | 北京智谷睿拓技术服务有限公司 | Exchange method, device and user equipment |
| CN103973975A (en) * | 2014-04-10 | 2014-08-06 | 北京智谷睿拓技术服务有限公司 | Interaction method, interaction device and user equipment |
| CN104615375A (en) * | 2015-02-04 | 2015-05-13 | 华为技术有限公司 | Method and device for image scaling and broadcast content switching of handheld electronic equipment |
| CN105760019A (en) * | 2016-02-22 | 2016-07-13 | 广州视睿电子科技有限公司 | Touch operation method based on interactive whiteboard and system thereof |
| WO2017143860A1 (en) * | 2016-02-22 | 2017-08-31 | 广州视睿电子科技有限公司 | Touch operation method based on interactive electronic white board and system thereof |
| CN105760019B (en) * | 2016-02-22 | 2019-04-09 | 广州视睿电子科技有限公司 | Touch operation method and its system based on interactive electric whiteboard |
| WO2017185575A1 (en) * | 2016-04-28 | 2017-11-02 | 北京金山办公软件有限公司 | Touch screen track recognition method and apparatus |
| US11042290B2 (en) | 2016-04-28 | 2021-06-22 | Beijing Kingsoft Office Software, Inc. | Touch screen track recognition method and apparatus |
| CN106201120A (en) * | 2016-07-14 | 2016-12-07 | 深圳市艾博德科技股份有限公司 | A kind of infrared electronic white board writes the control method of scanning and scanning system and infrared electronic white board lettering pen |
| CN107132944A (en) * | 2017-03-23 | 2017-09-05 | 福建天泉教育科技有限公司 | A kind of method for deleting and system for electronic whiteboard |
| CN108376046A (en) * | 2018-01-25 | 2018-08-07 | 链家网（北京）科技有限公司 | A kind of method, interactive system and device suitable for remote interaction |
| CN110058723A (en) * | 2019-01-28 | 2019-07-26 | 北京科加触控技术有限公司 | A kind of Writing method, apparatus and system |
| CN110058723B (en) * | 2019-01-28 | 2022-10-28 | 北京科加触控技术有限公司 | Writing method, device and system |
| CN114115686A (en) * | 2021-10-22 | 2022-03-01 | 北京壹人壹本信息科技有限公司 | Method and device for separating hand, stylus and touch in H5 webpage handwriting application and storage medium |
| CN114115686B (en) * | 2021-10-22 | 2024-04-30 | 北京壹人壹本信息科技有限公司 | Method, device and storage medium for separating hand touch pen and touch in H5 webpage handwriting application |
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Application publication date: 20110518 |